I got a ballistic battery rx pack today and an expert electronics rx charger. I just realised that the ballistic pack is nimh and the charger says it charges nicad. Can I use this charger to charge my new pack or do I need another one and if so can you recommend one?

it didnt come with any instructions but on the box it says nicad charger but says nothing about not charging nimhs. Also I tried plugging my battery into it and the little red chargeing indicator light turned on so does this mean I can use it?

If it doesn't say anywhere on the charger that it can charge nimh then don't use it. It will charge the batteries, but since the peak sensitivity is set different for nicad rather than nimh your battery will burn up.
Gotta go get a new charger.